Buick 1993 LeSabre Owner's Manual page 207

When your vehicle is being towed, have the ignition key
off. The steering wheel should be clamped in a
straight-ahead position, with a clamping device designed
for towing service. Do not use the vehicle's steering
column lock for this. The transaxle should be in Neutral
and the parking brake released.
Don't have your vehicle towed on the front wheels,
unless you must. If the vehicle must be towed on the
front wheels, don't go more than 55 mph (88 kph) or
farther than 500 miles (800
km)
or your transaxle will
be damaged. If these limits must be exceeded, then the
front wheels have to be supported on a dolly.
-
A
CAUTION:
A
vehicle can fall from a car carrier if
it isn't
properly secured, This can cause a collision,
serious personal injury and vehlcle damage. The
vehicle should be tightly secured with chains or
steel cables before
it
is transported.
Don't use substitutes (ropes, leather straps,
canvas webbing, etc.) that can be cut by sharp
zdges underneath the towed vehicle.